How to repair dead mobile charger circuit

The above image shows the inside of a typical mobile charger. These chargers can burn anytime and then they need to be replaced or repaired. This tutorial is about how to repair mobile charger circuit.

Fortunately the mobile charger repairing┬áprocess isn’t much hard as there are few components to check if the charger is dead.

The common things that usually burns/cuts is the transistor, the 1/2watt resistor in power mains line, and occasionally few of the 1/4watt resistors.

In this case the transistor was open. Note that the board had 120A transistor. And we can replace it by 13001 transistor easily. You can get two 13001 transistors from small (upto 11 watt) broken CFLs’ board.

Also note that the pinout of 120A and 13001 is mirrored. You need to insert it in the PCB rotated 180degree.

In this particular case, one 33Ohms resistor was open. And replacing it made the charger work again.

Yeah. Now the charger works. Note the LED is glowing.

Sometimes the electrolytic capacitors are also dead, you can find the bad capacitors by inspecting damages on those capacitors of the mobile charger circuit, usually the electrolytic capacitor’s vents are blown-up.

Bad resistors could be easily detected by inspecting the charred and blackened resistors or with a multimeter, you may need to replace them to repair mobile charger circuit.

Now just need to attach the output wire again and cover it up.

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35 Responses

  1. raj kumar gope says:

    Dear Sir,can you help me to find aprox price for pcb with components used in mobile charger,

  2. Manish Ojha says:

    Sir, I am facing a problem in the above chager TR 13001 is used and out put voltage is 5.0+ , when we use this charger with branded mobile it works ok , but when connected with Karbonn or any chinese mobile , the mobile functions does not work while charging. I tries and found that the voltage is kept 4.2-4.7V the mobile work and if the voltage is 4.7-60 it does not works. please guide.

  3. farhan says:

    nice tutorial

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